Checking The Flue Gas Flapper; Check Burner Refractory - Viessmann VITODENS 200-W Service Instructions Manual

Start-up and Service

Checking the Flue Gas Flapper

Check Burner Refractory

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Vitodens 200-W B2HA 112, 150 Service
1. Undo three screws and remove fan A.
2. Remove the flue gas flapper B.
3. Check the flapper and gasket for dirt and damage.
Replace as necessary.
4. Refit the flue gas flapper B.
5. Refit fan A and secure with three screws.
Torque: 2.2 lb.ft. (3.0 Nm).
Check the burner refractory ring C and DHW tank burner
assembly E for damage and replace if necessary.
1. Remove electrode block and ionization electrode A.
2. Undo the three retaining clips B at the refractory
ring C and remove refractory ring C.
3. Loosen the four Torx screws D and remove DHW
tank burner assembly E and assembly gasket F.
4. Fit and secure new DHW tank burner assembly E
and new assembly gasket F. Tighten to a torque of
3.3 lb.ft. (4.5 Nm) using a calibrated torque wrench.
5. Reinstall refractory ring C and secure with retaining
clip B.
6. Reinstall electrode block and ionization electrode A.
Tighten to a torque of 3 lb.ft. (4 Nm) using a
calibrated torque wrench.